MCS260
CORNERSTONE 260 MONOCHROMATORS
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8.2 F NUMBER MATCHING
The Cornerstone 260 monochromator is an F/3.9 instrument. Without matching the F/# of the
incoming light beam, stray light increases and throughput of desired signal suffers. To illustrate
this, the photos below show a fiber optic cable placed at the entrance of a monochromator. Fibers
are typically F/2. The Oriel model 77529 may be used to match the F/# to the monochromator.
Figure 23: Mismatched F Numbers Resulting in Stray Light
Figure 24: F Number Matcher Used with Fiber Optic Cable
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